/*
Copyright (C) 1996-1997 Id Software, Inc.


This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.


This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


See the GNU General Public License for more details.


You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


*/
// common.c -- misc functions used in client and server


#include "quakedef.h"

// mh #1 - define of variable needed for libpng to link
// FILE *_iob = NULL;

#define NUM_SAFE_ARGVS  7


static char     *largv[MAX_NUM_ARGVS + NUM_SAFE_ARGVS + 1];
static char     *argvdummy = " ";


static char     *safeargvs[NUM_SAFE_ARGVS] =
{"-stdvid", "-nolan", "-nosound", "-nocdaudio", "-nojoy", "-nomouse", "-dibonly"};


cvar_t  registered = {"registered","0"};
cvar_t  cmdline = {"cmdline","0", false, true};


qboolean        com_modified;   // set true if using non-id files


qboolean		proghack;


int             static_registered = 1;  // only for startup check, then set


qboolean		msg_suppress_1 = 0;


void COM_InitFilesystem (void);


// if a packfile directory differs from this, it is assumed to be hacked
#define PAK0_COUNT              339
#define PAK0_CRC                32981


char	com_token[1024];
int		com_argc;
char	**com_argv;


#define CMDLINE_LENGTH	1024 //upped cmdline_length from 256 to 1024 - Eradicator
char	com_cmdline[CMDLINE_LENGTH];


qboolean		standard_quake = true, rogue, hipnotic;


// this graphic needs to be in the pak file to use registered features
unsigned short pop[] =
{
    0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
    ,0x0000,0x0000,0x6600,0x0000,0x0000,0x0000,0x6600,0x0000
    ,0x0000,0x0066,0x0000,0x0000,0x0000,0x0000,0x0067,0x0000
    ,0x0000,0x6665,0x0000,0x0000,0x0000,0x0000,0x0065,0x6600
    ,0x0063,0x6561,0x0000,0x0000,0x0000,0x0000,0x0061,0x6563
    ,0x0064,0x6561,0x0000,0x0000,0x0000,0x0000,0x0061,0x6564
    ,0x0064,0x6564,0x0000,0x6469,0x6969,0x6400,0x0064,0x6564
    ,0x0063,0x6568,0x6200,0x0064,0x6864,0x0000,0x6268,0x6563
    ,0x0000,0x6567,0x6963,0x0064,0x6764,0x0063,0x6967,0x6500
    ,0x0000,0x6266,0x6769,0x6a68,0x6768,0x6a69,0x6766,0x6200
    ,0x0000,0x0062,0x6566,0x6666,0x6666,0x6666,0x6562,0x0000
    ,0x0000,0x0000,0x0062,0x6364,0x6664,0x6362,0x0000,0x0000
    ,0x0000,0x0000,0x0000,0x0062,0x6662,0x0000,0x0000,0x0000
    ,0x0000,0x0000,0x0000,0x0061,0x6661,0x0000,0x0000,0x0000
    ,0x0000,0x0000,0x0000,0x0000,0x6500,0x0000,0x0000,0x0000
    ,0x0000,0x0000,0x0000,0x0000,0x6400,0x0000,0x0000,0x0000
};


/*




All of Quake's data access is through a hierchal file system, but the contents of the file system can be transparently merged from several sources.


The "base directory" is the path to the directory holding the quake.exe and all game directories.  The sys_* files pass this to host_init in quakeparms_t->basedir.  This can be overridden with the "-basedir" command line parm to allow code debugging in a different directory.  The base directory is
only used during filesystem initialization.


The "game directory" is the first tree on the search path and directory that all generated files (savegames, screenshots, demos, config files) will be saved to.  This can be overridden with the "-game" command line parameter.  The game directory can never be changed while quake is executing.  This is a precacution against having a malicious server instruct clients to write files over areas they shouldn't.


The "cache directory" is only used during development to save network bandwidth, especially over ISDN / T1 lines.  If there is a cache directory
specified, when a file is found by the normal search path, it will be mirrored
into the cache directory, then opened there.






FIXME:
The file "parms.txt" will be read out of the game directory and appended to the current command line arguments to allow different games to initialize startup parms differently.  This could be used to add a "-sspeed 22050" for the high quality sound edition.  Because they are added at the end, they will not override an explicit setting on the original command line.

*/


//============================================================================

// ClearLink is used for new headnodes
void ClearLink (link_t *l)
{
    l->prev = l->next = l;
}

void RemoveLink (link_t *l)
{
    l->next->prev = l->prev;
    l->prev->next = l->next;
}

void InsertLinkBefore (link_t *l, link_t *before)
{
    l->next = before;
    l->prev = before->prev;
    l->prev->next = l;
    l->next->prev = l;
}

void InsertLinkAfter (link_t *l, link_t *after)
{
    l->next = after->next;
    l->prev = after;
    l->prev->next = l;
    l->next->prev = l;
}


/*
============================================================================


					LIBRARY REPLACEMENT FUNCTIONS


============================================================================
*/


void Q_memset (void *dest, int fill, int count)
{
    int             i;

    if ((((long)dest | count) & 3) == 0)
    {
        count >>= 2;

        fill = fill | (fill<<8) | (fill<<16) | (fill<<24);

        for (i=0 ; i<count ; i++)
		{
            ((int *)dest)[i] = fill;
		}
    }
    else
	{
        for (i=0 ; i<count ; i++)
		{
            ((byte *)dest)[i] = fill;
		}
	}
}


void Q_memcpy (void *dest, void *src, int count)
{
    int             i;

    if ((((long)dest | (long)src | count) & 3) == 0)
    {
        count >>= 2;

        for (i=0 ; i<count ; i++)
		{
            ((int *)dest)[i] = ((int *)src)[i];
		}
    }
    else
	{
        for (i=0 ; i<count ; i++)
		{
            ((byte *)dest)[i] = ((byte *)src)[i];
		}
	}
}


int Q_memcmp (void *m1, void *m2, int count)
{
    while(count)
    {
        count--;

        if (((byte *)m1)[count] != ((byte *)m2)[count])
		{
            return -1;
		}
    }
    return 0;
}


void Q_strcpy (char *dest, char *src)
{
    while (*src)
    {
        *dest++ = *src++;
    }
    *dest++ = 0;
}


void Q_strncpy (char *dest, char *src, int count)
{
    while (*src && count--)
    {
        *dest++ = *src++;
    }

    if (count)
	{
        *dest++ = 0;
	}
}


int Q_strlen (char *str)
{
    int             count;

    count = 0;

    while (str[count])
	{
        count++;
	}
    return count;
}


char *Q_strrchr(char *s, char c)
{
    int len = Q_strlen(s);

    s += len;

    while (len--)
	{
        if (*--s == c)
		{
			return s;
		}
	}
    return 0;
}


void Q_strcat (char *dest, char *src)
{
    dest += Q_strlen(dest);
    Q_strcpy (dest, src);
}

void Q_strncat (char *dest, char *src, int size)
{
    int tmpsize;
    tmpsize = Q_strlen(dest);
    size -= tmpsize;
    dest += tmpsize;
    Q_strncpy (dest, src, tmpsize);
}


int Q_strcmp (char *s1, char *s2)
{
    while (1)
    {
        if (*s1 != *s2)
            return -1;              // strings not equal
        if (!*s1)
            return 0;               // strings are equal
        s1++;
        s2++;
    }

    return -1;
}


int Q_strncmp (char *s1, char *s2, int count)
{
    while (1)
    {
        if (!count--)
        {
            return 0;
        }

        if (*s1 != *s2)
        {
            return -1;              // strings not equal
        }

        if (!*s1)
        {
            return 0;               // strings are equal
        }
        s1++;
        s2++;
    }
    return -1;
}


int Q_strncasecmp (char *s1, char *s2, int n)
{
    int             c1, c2;

    while (1)
    {
        c1 = *s1++;
        c2 = *s2++;

        if (!n--)
        {
            return 0;                   // strings are equal until end point
        }

        if (c1 != c2)
        {
            if (c1 >= 'a' && c1 <= 'z')
            {
                c1 -= ('a' - 'A');
            }

            if (c2 >= 'a' && c2 <= 'z')
            {
                c2 -= ('a' - 'A');
            }

            if (c1 != c2)
            {
                return -1;              // strings not equal
            }
        }

        if (!c1)
        {
            return 0;                   // strings are equal
        }
    }
    return -1;
}


int Q_strcasecmp (char *s1, char *s2)
{
    return Q_strncasecmp (s1, s2, 99999);
}


int Q_atoi (char *str)
{
    int             val;
    int             sign;
    int             c;

    if (*str == '-')
    {
        sign = -1;
        str++;
    }
    else
    {
        sign = 1;
    }
    val = 0;

//
// check for hex
//
    if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X') )
    {
        str += 2;

        while (1)
        {
            c = *str++;

            if (c >= '0' && c <= '9')
            {
                val = (val<<4) + c - '0';
            }
            else if (c >= 'a' && c <= 'f')
            {
                val = (val<<4) + c - 'a' + 10;
            }
            else if (c >= 'A' && c <= 'F')
            {
                val = (val<<4) + c - 'A' + 10;
            }
            else
            {
                return val*sign;
            }
        }
    }

//
// check for character
//
    if (str[0] == '\'')
    {
        return sign * str[1];
    }

//
// assume decimal
//
    while (1)
    {
        c = *str++;

        if (c <'0' || c > '9')
        {
            return val*sign;
        }
        val = val*10 + c - '0';
    }
    return 0;
}

float Q_atof (char *str)
{
    double			val;
    int             sign;
    int             c;
    int             decimal, total;

    if (*str == '-')
    {
        sign = -1;
        str++;
    }
    else
    {
        sign = 1;
    }
    val = 0;
//
// check for hex
//
    if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X') )
    {
        str += 2;

        while (1)
        {
            c = *str++;

            if (c >= '0' && c <= '9')
            {
                val = (val*16) + c - '0';
            }
            else if (c >= 'a' && c <= 'f')
            {
                val = (val*16) + c - 'a' + 10;
            }
            else if (c >= 'A' && c <= 'F')
            {
                val = (val*16) + c - 'A' + 10;
            }
            else
            {
                return val*sign;
            }
        }
    }

//
// check for character
//
    if (str[0] == '\'')
    {
        return sign * str[1];
    }

//
// assume decimal
//
    decimal = -1;
    total = 0;

    while (1)
    {
        c = *str++;

        if (c == '.')
        {
            decimal = total;
            continue;
        }

        if (c <'0' || c > '9') break;
        val = val*10 + c - '0';
        total++;
    }


    if (decimal == -1)
    {
        return val*sign;
    }

    while (total > decimal)
    {
        val /= 10;
        total--;
    }
    return val*sign;
}


/*
============================================================================


					BYTE ORDER FUNCTIONS


============================================================================
*/

// - DC - imported from sdlquake
#ifdef SDL
#include "SDL_byteorder.h"
#endif

qboolean        bigendien;

short   (*BigShort) (short l);
short   (*LittleShort) (short l);
int     (*BigLong) (int l);
int     (*LittleLong) (int l);
float   (*BigFloat) (float l);
float   (*LittleFloat) (float l);

short   ShortSwap (short l)
{
    byte    b1, b2;

    b1 = l&255;
    b2 = (l >> 8) & 255;

    return (b1 << 8) + b2;
}

short   ShortNoSwap (short l)
{
    return l;
}

int    LongSwap (int l)
{
    byte    b1,b2,b3,b4;

    b1 = l & 255;
    b2 = (l >> 8) & 255;
    b3 = (l >> 16) & 255;
    b4 = (l >> 24) & 255;

    return ((int)b1 << 24) + ((int)b2 << 16) + ((int)b3 << 8) + b4;
}

int LongNoSwap (int l)
{
    return l;
}

float FloatSwap (float f)
{
    union
    {
        float   f;
        byte    b[4];
    } dat1, dat2;

    dat1.f = f;
    dat2.b[0] = dat1.b[3];
    dat2.b[1] = dat1.b[2];
    dat2.b[2] = dat1.b[1];
    dat2.b[3] = dat1.b[0];

    return dat2.f;
}

float FloatNoSwap (float f)
{
    return f;
}

/*
==============================================================================


			MESSAGE IO FUNCTIONS


Handles byte ordering and avoids alignment errors
==============================================================================
*/

//
// writing functions
//
void MSG_WriteChar (sizebuf_t *sb, int c)
{
    byte    *buf;

#ifdef PARANOID
    if (c < -128 || c > 127)
        Sys_Error ("MSG_WriteChar: range error");
#endif
    buf = SZ_GetSpace (sb, 1);
    buf[0] = c;
}

void MSG_WriteByte (sizebuf_t *sb, int c)
{
    byte    *buf;

#ifdef PARANOID
    if (c < 0 || c > 255)
        Sys_Error ("MSG_WriteByte: range error");
#endif
    buf = SZ_GetSpace (sb, 1);
    buf[0] = c;
}

void MSG_WriteShort (sizebuf_t *sb, int c)
{
    byte    *buf;

#ifdef PARANOID
    if (c < ((short)0x8000) || c > (short)0x7fff)
        Sys_Error ("MSG_WriteShort: range error");
#endif
    buf = SZ_GetSpace (sb, 2);
    buf[0] = c&0xff;
    buf[1] = c>>8;
}


void MSG_WriteLong (sizebuf_t *sb, int c)
{
    byte    *buf;

    buf = SZ_GetSpace (sb, 4);
    buf[0] = c&0xff;
    buf[1] = (c>>8)&0xff;
    buf[2] = (c>>16)&0xff;
    buf[3] = c>>24;
}

void MSG_WriteFloat (sizebuf_t *sb, float f)
{
    union
    {
        float   f;
        int     l;
    } dat;

    dat.f = f;
    dat.l = LittleLong (dat.l);

    SZ_Write (sb, &dat.l, 4);
}

void MSG_WriteString (sizebuf_t *sb, char *s)
{
    if (!s)
    {
        SZ_Write (sb, "", 1);
    }
    else
    {
        SZ_Write (sb, s, Q_strlen(s) + 1);
    }
}

void MSG_WriteCoord (sizebuf_t *sb, float f)
{
    MSG_WriteShort (sb, (int)(f*8));
}

//Round to nearest value, rather than rounding toward zero - Eradicator
void MSG_WriteAngle (sizebuf_t *sb, float f)
{
    if (f >= 0)
    {
        MSG_WriteByte (sb, (int)(f*(256.0f/360.0f) + 0.5f) & 255);
    }
    else
    {
        MSG_WriteByte (sb, (int)(f*(256.0f/360.0f) - 0.5f) & 255);
    }
}

//
// reading functions
//
int             msg_readcount;
qboolean        msg_badread;

void MSG_BeginReading (void)
{
    msg_readcount = 0;
    msg_badread = false;
}

// returns -1 and sets msg_badread if no more characters are available
int MSG_ReadChar (void)
{
    int     c;

    if (msg_readcount+1 > net_message.cursize)
    {
        msg_badread = true;
        return -1;
    }

    c = (signed char)net_message.data[msg_readcount];
    msg_readcount++;

    return c;
}

int MSG_ReadByte (void)
{
    int     c;

    if (msg_readcount + 1 > net_message.cursize)
    {
        msg_badread = true;
        return -1;
    }
    c = (unsigned char) net_message.data[msg_readcount];
    msg_readcount++;

    return c;
}

int MSG_ReadShort (void)
{
    int     c;

    if (msg_readcount+2 > net_message.cursize)
    {
        msg_badread = true;
        return -1;
    }
    c = (short)(net_message.data[msg_readcount] + (net_message.data[msg_readcount + 1] << 8));

    msg_readcount += 2;

    return c;
}

int MSG_ReadLong (void)
{
    int     c;

    if (msg_readcount+4 > net_message.cursize)
    {
        msg_badread = true;
        return -1;
    }
    c = net_message.data[msg_readcount]
    + (net_message.data[msg_readcount + 1] << 8)
    + (net_message.data[msg_readcount + 2] << 16)
    + (net_message.data[msg_readcount + 3] << 24);

    msg_readcount += 4;

    return c;
}

float MSG_ReadFloat (void)
{
    union
    {
        byte    b[4];
        float   f;
        int     l;
    } dat;

    dat.b[0] = net_message.data[msg_readcount];
    dat.b[1] = net_message.data[msg_readcount+1];
    dat.b[2] = net_message.data[msg_readcount+2];
    dat.b[3] = net_message.data[msg_readcount+3];
    msg_readcount += 4;

    dat.l = LittleLong (dat.l);

    return dat.f;
}

char *MSG_ReadString (void)
{
    static char     string[2048];
    int             l, c;

    l = 0;

    do
    {
        c = MSG_ReadChar ();
        if (c == -1 || c == 0) break;
        string[l] = c;
        l++;
    } while (l < sizeof(string) - 1);

    string[l] = 0;

    return string;
}

float MSG_ReadCoord (void)
{
    return MSG_ReadShort() * (0.125f); //Spedup Small Calculation - Eradicator
}

float MSG_ReadAngle (void)
{
    return MSG_ReadChar() * (1.40625f); //Spedup Small Calculation - Eradicator
}

//===========================================================================
void SZ_Alloc (sizebuf_t *buf, int startsize)
{
    if (startsize < 256)
    {
        startsize = 256;
    }
    buf->data = Hunk_AllocName (startsize, "sizebuf");
    buf->maxsize = startsize;
    buf->cursize = 0;
}

void SZ_Free (sizebuf_t *buf)
{
    buf->cursize = 0;
}

void SZ_Clear (sizebuf_t *buf)
{
    buf->cursize = 0;
}

void *SZ_GetSpace (sizebuf_t *buf, int length)
{
    void    *data;

    if (buf->cursize + length > buf->maxsize)
    {
        if (!buf->allowoverflow)
        {
            Sys_Error ("SZ_GetSpace: overflow without allowoverflow set");
        }

        if (length > buf->maxsize)
        {
            Sys_Error ("SZ_GetSpace: %i is > full buffer size", length);
        }
        buf->overflowed = true;
        Con_Printf ("SZ_GetSpace: overflow");
        SZ_Clear (buf);
    }
    data = buf->data + buf->cursize;
    buf->cursize += length;

    return data;
}

void SZ_Write (sizebuf_t *buf, void *data, int length)
{
    Q_memcpy (SZ_GetSpace(buf,length),data,length);
}

void SZ_Print (sizebuf_t *buf, char *data)
{
    int             len;

    len = Q_strlen(data) + 1;

// byte * cast to keep VC++ happy
    if (buf->data[buf->cursize-1])
    {
        Q_memcpy ((byte *)SZ_GetSpace(buf, len), data, len);            // no trailing 0
    }
    else
    {
        Q_memcpy ((byte *)SZ_GetSpace(buf, len - 1) - 1, data, len);    // write over trailing 0
    }
}

//============================================================================

/*
============
COM_SkipPath
============
*/
char *COM_SkipPath (char *pathname)
{
    char    *last;

    last = pathname;

    while (*pathname)
    {
        if (*pathname=='/')
        {
            last = pathname + 1;
        }
        pathname++;
    }
    return last;
}

/*
============
COM_StripExtension
============
*/
void COM_StripExtension (char *in, char *out) //Fixed function - Eradicator
{
    char *last = NULL;

    while (*in)
    {
        if (*in == '.')
        {
            last = out;
        }
        else if (*in == '/' || *in == '\\' || *in == ':')
        {
            last = NULL;
        }
        *out++ = *in++;
    }

    if (last)
    {
        *last = 0;
    }
    else
    {
        *out = 0;
    }
}

/*
============
COM_FileExtension
============
*/
char *COM_FileExtension (char *in)
{
    static char exten[30];
    int             i;


    while (*in && *in != '.')
    {
        in++;
    }

    if (!*in)
    {
        return "";
    }
    in++;

    for (i=0 ; i<29 && *in ; i++,in++)
    {
        exten[i] = *in;
    }
    exten[i] = 0;

    return exten;
}

/*
============
COM_FileBase
============
*/
void COM_FileBase (const char *in, char *out)
{
    const char *s2;
    const char *s;

    s = in + strlen(in) - 1;

    while (s != in && *s != '.')
    {
        s--;
    }

    for (s2 = s ; *s2 && *s2 != '/' ; s2--);

    if (s - s2 < 2)
    {
        strcpy (out,"?model?");
    }
    else
    {
        s--;
        strncpy (out, s2 + 1, s - s2);
        out[s - s2] = 0;
    }
}

/*
==================
COM_DefaultExtension
==================
*/
void COM_DefaultExtension (char *path, char *extension)
{
    char    *src;
//
// if path doesn't have a .EXT, append extension
// (extension should include the .)
//
    src = path + strlen(path) - 1;

    while (*src != '/' && src != path)
    {
        if (*src == '.') return;                 // it has an extension
        src--;
    }
    strcat (path, extension);
}

/*
==============
COM_Parse


Parse a token out of a string
==============
*/
char *COM_Parse (char *data)
{
    int             c;
    int             len;

    len = 0;
    com_token[0] = 0;

    if (!data)
    {
        return NULL;
    }

// skip whitespace
skipwhite:
    while ( (c = *data) <= ' ')
    {
        if (c == 0)
        {
            return NULL;                    // end of file;
        }
        data++;
    }

// skip // comments
    if (c=='/' && data[1] == '/')
    {
        while (*data && *data != '\n')
        {
            data++;
        }
        goto skipwhite;
    }

// handle quoted strings specially
    if (c == '\"')
    {
        data++;

        while (1)
        {
            c = *data++;

            if (c=='\"' || !c)
            {
                com_token[len] = 0;
                return data;
            }
            com_token[len] = c;
            len++;
        }
    }

// parse single characters
    if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
    {
        com_token[len] = c;
        len++;
        com_token[len] = 0;
        return data+1;
    }

// parse a regular word
    do
    {
        com_token[len] = c;
        data++;
        len++;
        c = *data;
        if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':') break;
    }
    while (c>32);

    com_token[len] = 0;

    return data;
}

/*
================
COM_CheckParm


Returns the position (1 to argc-1) in the program's argument list
where the given parameter apears, or 0 if not present
================
*/
int COM_CheckParm (char *parm)
{
    int             i;

    for (i=1 ; i<com_argc ; i++)
    {
        if (!com_argv[i]) continue;               // NEXTSTEP sometimes clears appkit vars.

        if (!Q_strcmp (parm,com_argv[i]))
        {
            return i;
        }
    }
    return 0;
}

/*
================
COM_CheckRegistered


Looks for the pop.txt file and verifies it.
Sets the "registered" cvar.
Immediately exits out if an alternate game was attempted to be started without
being registered.


PENTA: let unregistred users play.
We make shure we don't allow them to walk into the 3 episode slipgates by
setting Cvar_Set ("registered", "0")
================
*/
void COM_CheckRegistered (void)
{
    int             h;
    unsigned short  check[128];
    int  		    i;

    Cvar_Set ("cmdline", com_cmdline);
    Cvar_Set ("registered", "1");
    static_registered = 1;

    COM_OpenFile("gfx/pop.lmp", &h);
    static_registered = 0;

    if (h == -1)
    {
#if WINDED
        Sys_Error ("This dedicated server requires a full registered copy of Quake");
#endif
        Con_Printf ("Playing shareware version.\n");
        Cvar_Set ("registered", "0");
        static_registered = 1;
        return;
    }
    Sys_FileRead (h, check, sizeof(check));
    COM_CloseFile (h);
    static_registered = 1;

    for (i=0 ; i<128 ; i++)
    {
        if (pop[i] != (unsigned short)BigShort (check[i]))
        {
            Sys_Error ("Corrupted data file.");
        }
    }
    Cvar_Set ("cmdline", com_cmdline);
    Cvar_Set ("registered", "1");
    static_registered = 1;
    Con_Printf ("Playing registered version.\n");
}

void COM_Path_f (void);

/*
================
COM_InitArgv
================
*/
void COM_InitArgv (int argc, char **argv)
{
    qboolean        safe;
    int             i, j, n;

// reconstitute the command line for the cmdline externally visible cvar
    n = 0;

    for (j=0 ; (j<MAX_NUM_ARGVS) && (j< argc) ; j++)
    {
        i = 0;

        while ((n < (CMDLINE_LENGTH - 1)) && argv[j][i])
        {
            com_cmdline[n++] = argv[j][i++];
        }

        if (n < (CMDLINE_LENGTH - 1))
        {
            com_cmdline[n++] = ' ';
        }
        else break;
    }
    com_cmdline[n] = 0;

    safe = false;

    for (com_argc=0 ; (com_argc<MAX_NUM_ARGVS) && (com_argc < argc) ; com_argc++)
    {
        largv[com_argc] = argv[com_argc];

        if (!Q_strcmp ("-safe", argv[com_argc]))
        {
            safe = true;
        }
    }


    if (safe)
    {
        // force all the safe-mode switches. Note that we reserved extra space in
        // case we need to add these, so we don't need an overflow check
        for (i=0 ; i<NUM_SAFE_ARGVS ; i++)
        {
            largv[com_argc] = safeargvs[i];
            com_argc++;
        }
    }
    largv[com_argc] = argvdummy;
    com_argv = largv;

    if (COM_CheckParm ("-rogue"))
    {
        rogue = true;
        standard_quake = false;
    }

    if (COM_CheckParm ("-hipnotic"))
    {
        hipnotic = true;
        standard_quake = false;
    }
}

/*
================
COM_Init
================
*/
void COM_Init (char *basedir)
{
    byte    swaptest[2] = {1,0};

// set the byte swapping variables in a portable manner
// -DC - imported from sdlquake
#ifdef SDL
    // This is necessary because egcs 1.1.1 mis-compiles swaptest with -O2
    if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
#else
    if ( *(short *)swaptest == 1)
#endif
    {
        bigendien = false;
        BigShort = ShortSwap;
        LittleShort = ShortNoSwap;
        BigLong = LongSwap;
        LittleLong = LongNoSwap;
        BigFloat = FloatSwap;
        LittleFloat = FloatNoSwap;
    }
    else
    {
        bigendien = true;
        BigShort = ShortNoSwap;
        LittleShort = ShortSwap;
        BigLong = LongNoSwap;
        LittleLong = LongSwap;
        BigFloat = FloatNoSwap;
        LittleFloat = FloatSwap;
    }
    Cvar_RegisterVariable (&registered, NULL);
    Cvar_RegisterVariable (&cmdline, NULL);
    Cmd_AddCommand ("path", COM_Path_f);

    COM_InitFilesystem ();
    COM_CheckRegistered ();
}

/*
============================================================================

					LIBRARY REPLACEMENT FUNCTIONS

============================================================================
*/

/* BSD print buffers, correctly nulled out */
#ifndef VA_COPY
#ifdef __MINGW32__
#define VA_COPY(dest, src) va_copy(dest, src)
#else
#define VA_COPY(dest, src) (dest) = (src)
#endif
#endif

#ifdef _WIN64
# define LDOUBLE long double
#else
# define LDOUBLE double
#endif

#ifdef _WIN64
# define LLONG long long
#else
# define LLONG long
#endif

/*
 * dopr(): poor man's version of doprintf
 */

/* format read states */
#define DP_S_DEFAULT 0
#define DP_S_FLAGS   1
#define DP_S_MIN     2
#define DP_S_DOT     3
#define DP_S_MAX     4
#define DP_S_MOD     5
#define DP_S_CONV    6
#define DP_S_DONE    7

/* format flags - Bits */
#define DP_F_MINUS       (1 << 0)
#define DP_F_PLUS      (1 << 1)
#define DP_F_SPACE       (1 << 2)
#define DP_F_NUM         (1 << 3)
#define DP_F_ZERO        (1 << 4)
#define DP_F_UP          (1 << 5)
#define DP_F_UNSIGNED    (1 << 6)

/* Conversion Flags */
#define DP_C_SHORT   1
#define DP_C_LONG    2
#define DP_C_LDOUBLE 3
#define DP_C_LLONG   4

#define char_to_int(p) ((p)- '0')
#ifndef MAX
# define MAX(p,q) (((p) >= (q)) ? (p) : (q))
#endif

#define DOPR_OUTCH(buf, pos, buflen, thechar) \
   do { \
      if (pos + 1 >= INT_MAX) { \
         errno = ERANGE; \
         return -1; \
      } \
      if (pos < buflen) \
         buf[pos] = thechar; \
      (pos)++; \
   } while (0)

static inline int dopr(char *buffer, size_t maxlen, const char *format, va_list args_in);
static inline int fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags, int min, int max);
static inline int fmtint(char *buffer, size_t *currlen, size_t maxlen, LLONG value, int base, int min, int max, int flags);
static inline int fmtfp(char *buffer, size_t *currlen, size_t maxlen, LDOUBLE fvalue, int min, int max, int flags);

static inline int dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
{
    char        ch;
    LLONG       value;
    LDOUBLE     fvalue;
    char        *strvalue;
    int         min;
    int         max;
    int         state;
    int         flags;
    int         cflags;
    size_t      currlen;
    va_list     args;

    VA_COPY(args, args_in);

    state = DP_S_DEFAULT;
    currlen = flags = cflags = min = 0;
    max = -1;
    ch = *format++;

    while (state != DP_S_DONE)
    {
        if (ch == '\0')
            state = DP_S_DONE;

        switch(state)
        {
        case DP_S_DEFAULT:
            if (ch == '%')
                state = DP_S_FLAGS;
            else
                DOPR_OUTCH(buffer, currlen, maxlen, ch);
            ch = *format++;
            break;
        case DP_S_FLAGS:
            switch (ch)
            {
            case '-':
                flags |= DP_F_MINUS;
                ch = *format++;
                break;
            case '+':
                flags |= DP_F_PLUS;
                ch = *format++;
                break;
            case ' ':
                flags |= DP_F_SPACE;
                ch = *format++;
                break;
            case '#':
                flags |= DP_F_NUM;
                ch = *format++;
                break;
            case '0':
                flags |= DP_F_ZERO;
                ch = *format++;
                break;
            default:
                state = DP_S_MIN;
                break;
            }
            break;
        case DP_S_MIN:
            if (isdigit((unsigned char)ch))
            {
                min = 10*min + char_to_int (ch);
                ch = *format++;
            }
            else if (ch == '*')
            {
                min = va_arg (args, int);
                ch = *format++;
                state = DP_S_DOT;
            }
            else
            {
                state = DP_S_DOT;
            }
            break;
        case DP_S_DOT:
            if (ch == '.')
            {
                state = DP_S_MAX;
                ch = *format++;
            }
            else
            {
                state = DP_S_MOD;
            }
            break;
        case DP_S_MAX:
            if (isdigit((unsigned char)ch))
            {
                if (max < 0)
                    max = 0;
                max = 10*max + char_to_int (ch);
                ch = *format++;
            }
            else if (ch == '*')
            {
                max = va_arg (args, int);
                ch = *format++;
                state = DP_S_MOD;
            }
            else
            {
                state = DP_S_MOD;
            }
            break;
        case DP_S_MOD:
            switch (ch)
            {
            case 'h':
                cflags = DP_C_SHORT;
                ch = *format++;
                break;
            case 'l':
                cflags = DP_C_LONG;
                ch = *format++;
                if (ch == 'l')
                {
                    /* It's a long long */
                    cflags = DP_C_LLONG;
                    ch = *format++;
                }
                break;
            case 'L':
                cflags = DP_C_LDOUBLE;
                ch = *format++;
                break;
            default:
                break;
            }
            state = DP_S_CONV;
            break;
        case DP_S_CONV:
            switch (ch)
            {
            case 'd':
            case 'i':
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, int);
                else if (cflags == DP_C_LONG)
                    value = va_arg (args, long int);
                else if (cflags == DP_C_LLONG)
                    value = va_arg (args, LLONG);
                else
                    value = va_arg (args, int);
                if (fmtint(buffer, &currlen, maxlen,
                           value, 10, min, max, flags) == -1)
                    return -1;
                break;
            case 'o':
                flags |= DP_F_UNSIGNED;
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, unsigned int);
                else if (cflags == DP_C_LONG)
                    value = (long)va_arg (args, unsigned long int);
                else if (cflags == DP_C_LLONG)
                    value = (long)va_arg (args, unsigned LLONG);
                else
                    value = (long)va_arg (args, unsigned int);
                if (fmtint(buffer, &currlen, maxlen, value,
                           8, min, max, flags) == -1)
                    return -1;
                break;
            case 'u':
                flags |= DP_F_UNSIGNED;
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, unsigned int);
                else if (cflags == DP_C_LONG)
                    value = (long)va_arg (args, unsigned long int);
                else if (cflags == DP_C_LLONG)
                    value = (LLONG)va_arg (args, unsigned LLONG);
                else
                    value = (long)va_arg (args, unsigned int);
                if (fmtint(buffer, &currlen, maxlen, value,
                           10, min, max, flags) == -1)
                    return -1;
                break;
            case 'X':
                flags |= DP_F_UP;
            case 'x':
                flags |= DP_F_UNSIGNED;
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, unsigned int);
                else if (cflags == DP_C_LONG)
                    value = (long)va_arg (args, unsigned long int);
                else if (cflags == DP_C_LLONG)
                    value = (LLONG)va_arg (args, unsigned LLONG);
                else
                    value = (long)va_arg (args, unsigned int);
                if (fmtint(buffer, &currlen, maxlen, value,
                           16, min, max, flags) == -1)
                    return -1;
                break;
            case 'f':
                if (cflags == DP_C_LDOUBLE)
                    fvalue = va_arg (args, LDOUBLE);
                else
                    fvalue = va_arg (args, double);
                if (fmtfp(buffer, &currlen, maxlen, fvalue,
                          min, max, flags) == -1)
                    return -1;
                break;
            case 'E':
                flags |= DP_F_UP;
            case 'e':
                if (cflags == DP_C_LDOUBLE)
                    fvalue = va_arg (args, LDOUBLE);
                else
                    fvalue = va_arg (args, double);
                if (fmtfp(buffer, &currlen, maxlen, fvalue,
                          min, max, flags) == -1)
                    return -1;
                break;
            case 'G':
                flags |= DP_F_UP;
            case 'g':
                if (cflags == DP_C_LDOUBLE)
                    fvalue = va_arg (args, LDOUBLE);
                else
                    fvalue = va_arg (args, double);
                if (fmtfp(buffer, &currlen, maxlen, fvalue,
                          min, max, flags) == -1)
                    return -1;
                break;
            case 'c':
                DOPR_OUTCH(buffer, currlen, maxlen, va_arg (args, int));
                break;
            case 's':
                strvalue = va_arg (args, char *);
                if (!strvalue) strvalue = "(NULL)";
                if (max == -1)
                {
                    max = strlen(strvalue);
                }
                if (min > 0 && max >= 0 && min > max) max = min;
                if (fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max) == -1)
                    return -1;
                break;
            case 'p':
                strvalue = va_arg (args, void *);
                if (fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags) == -1)
                    return -1;
                break;
            case 'n':
                if (cflags == DP_C_SHORT)
                {
                    short int *num;
                    num = va_arg (args, short int *);
                    *num = currlen;
                }
                else if (cflags == DP_C_LONG)
                {
                    long int *num;
                    num = va_arg (args, long int *);
                    *num = (long int)currlen;
                }
                else if (cflags == DP_C_LLONG)
                {
                    LLONG *num;
                    num = va_arg (args, LLONG *);
                    *num = (LLONG)currlen;
                }
                else
                {
                    int *num;
                    num = va_arg (args, int *);
                    *num = currlen;
                }
                break;
            case '%':
                DOPR_OUTCH(buffer, currlen, maxlen, ch);
                break;
            case 'w':
                /* not supported yet, treat as next char */
                ch = *format++;
                break;
            default:
                /* Unknown, skip */
                break;
            }
            ch = *format++;
            state = DP_S_DEFAULT;
            flags = cflags = min = 0;
            max = -1;
            break;
        case DP_S_DONE:
            break;
        default:
            /* hmm? */
            break; /* some picky compilers need this */
        }
    }

    if (maxlen != 0)
    {
        if (currlen < maxlen - 1)
        {
            buffer[currlen] = '\0';
        }
        else if (maxlen > 0)
        {
            buffer[maxlen - 1] = '\0';
        }
    }
    return currlen < INT_MAX ? (int)currlen : -1;
}

static inline int fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags, int min, int max)
{
    int padlen, strln;     /* amount to pad */
    int cnt = 0;

    if (value == 0)
    {
        value = "<NULL>";
    }

    for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */

    padlen = min - strln;

    if (padlen < 0)
    {
        padlen = 0;
    }

    if (flags & DP_F_MINUS)
    {
        padlen = -padlen; /* Left Justify */
    }

    while ((padlen > 0) && (cnt < max))
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
        --padlen;
        ++cnt;
    }

    while (*value && (cnt < max))
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, *value);
        *value++;
        ++cnt;
    }

    while ((padlen < 0) && (cnt < max))
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
        ++padlen;
        ++cnt;
    }
    return 0;
}

/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
static inline int fmtint(char *buffer, size_t *currlen, size_t maxlen, LLONG value, int base, int min, int max, int flags)
{
    int            signvalue = 0;
    unsigned LLONG   uvalue;
    char         convert[20];
    int            place = 0;
    int            spadlen = 0; /* amount to space pad */
    int            zpadlen = 0; /* amount to zero pad */
    int            caps = 0;

    if (max < 0)
    {
        max = 0;
    }
    uvalue = value;

    if(!(flags & DP_F_UNSIGNED))
    {
        if( value < 0 )
        {
            signvalue = '-';
            uvalue = -value;
        }
        else
        {
            if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
            {
                signvalue = '+';
            }
            else if (flags & DP_F_SPACE)
            {
                signvalue = ' ';
            }
        }
    }

    if (flags & DP_F_UP)
    {
        caps = 1; /* Should characters be upper case? */
    }

    do
    {
        convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef") [uvalue % (unsigned)base];
        uvalue = (uvalue / (unsigned)base );
    }
    while(uvalue && (place < 20));

    if (place == 20)
    {
        place--;
    }
    convert[place] = 0;

    zpadlen = max - place;
    spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);

    if (zpadlen < 0)
    {
        zpadlen = 0;
    }

    if (spadlen < 0)
    {
        spadlen = 0;
    }

    if (flags & DP_F_ZERO)
    {
        zpadlen = MAX(zpadlen, spadlen);
        spadlen = 0;
    }

    if (flags & DP_F_MINUS)
    {
        spadlen = -spadlen; /* Left Justifty */
    }

    /* Spaces */
    while (spadlen > 0)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
        --spadlen;
    }

    /* Sign */
    if (signvalue)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
    }

    /* Zeros */
    if (zpadlen > 0)
    {
        while (zpadlen > 0)
        {
            DOPR_OUTCH(buffer, *currlen, maxlen, '0');
            --zpadlen;
        }
    }

    /* Digits */
    while (place > 0)
    {
        --place;
        DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]);
    }

    /* Left Justified spaces */
    while (spadlen < 0)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
        ++spadlen;
    }
    return 0;
}

static inline LDOUBLE abs_val(LDOUBLE value)
{
    LDOUBLE result = value;

    if (value < 0)
        result = -value;

    return result;
}

static inline LDOUBLE POW10(int val)
{
    LDOUBLE result = 1;

    while (val)
    {
        result *= 10;
        val--;
    }

    return result;
}

static inline LLONG ROUND(LDOUBLE value)
{
    LLONG intpart;

    intpart = (LLONG)value;
    value = value - intpart;
    if (value >= 0.5) intpart++;

    return intpart;
}

/* a replacement for modf that doesn't need the math library. Should
   be portable, but slow */
static inline double my_modf(double x0, double *iptr)
{
    int      i;
    long   l;
    double   x = x0;
    double   f = 1.0;

    for (i=0; i<100; i++)
    {
        l = (long)x;
        if (l <= (x+1) && l >= (x-1)) break;
        x *= 0.1;
        f *= 10.0;
    }

    if (i == 100)
    {
        /*
         * yikes! the number is beyond what we can handle.
         * What do we do?
         */
        (*iptr) = 0;
        return 0;
    }

    if (i != 0)
    {
        double i2;
        double ret;

        ret = my_modf(x0-l*f, &i2);
        (*iptr) = l*f + i2;
        return ret;
    }
    (*iptr) = l;

    return x - (*iptr);
}

static inline int fmtfp (char *buffer, size_t *currlen, size_t maxlen, LDOUBLE fvalue, int min, int max, int flags)
{
    int signvalue = 0;
    double ufvalue;
    char iconvert[311];
    char fconvert[311];
    int iplace = 0;
    int fplace = 0;
    int padlen = 0; /* amount to pad */
    int zpadlen = 0;
    int caps = 0;
    int idx;
    double intpart;
    double fracpart;
    double temp;

    /*
     * AIX manpage says the default is 0, but Solaris says the default
     * is 6, and sprintf on AIX defaults to 6
     */
    if (max < 0)
    {
        max = 6;
    }

    ufvalue = abs_val (fvalue);

    if (fvalue < 0)
    {
        signvalue = '-';
    }
    else
    {
        if (flags & DP_F_PLUS)   /* Do a sign (+/i) */
        {
            signvalue = '+';
        }
        else
        {
            if (flags & DP_F_SPACE)
            {
                signvalue = ' ';
            }
        }
    }

    /*
     * Sorry, we only support 16 digits past the decimal because of our
     * conversion method
     */
    if (max > 16)
    {
        max = 16;
    }

    /* We "cheat" by converting the fractional part to integer by
     * multiplying by a factor of 10
     */
    temp = ufvalue;
    my_modf(temp, &intpart);

    fracpart = ROUND((POW10(max)) * (ufvalue - intpart));

    if (fracpart >= POW10(max))
    {
        intpart++;
        fracpart -= POW10(max);
    }

    /* Convert integer part */
    do
    {
        temp = intpart*0.1;
        my_modf(temp, &intpart);
        idx = (int) ((temp -intpart +0.05)* 10.0);
        iconvert[iplace++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")[idx];
    }
    while (intpart && (iplace < 311));

    if (iplace == 311)
    {
        iplace--;
    }
    iconvert[iplace] = 0;

    /* Convert fractional part */
    if (fracpart)
    {
        do
        {
            temp = fracpart*0.1;
            my_modf(temp, &fracpart);
            idx = (int) ((temp -fracpart +0.05)* 10.0);
            fconvert[fplace++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")[idx];
        }
        while(fracpart && (fplace < 311));

        if (fplace == 311)
        {
            fplace--;
        }
    }
    fconvert[fplace] = 0;

    /* -1 for decimal point, another -1 if we are printing a sign */
    padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
    zpadlen = max - fplace;
    if (zpadlen < 0) zpadlen = 0;
    if (padlen < 0)
        padlen = 0;
    if (flags & DP_F_MINUS)
        padlen = -padlen; /* Left Justifty */

    if ((flags & DP_F_ZERO) && (padlen > 0))
    {
        if (signvalue)
        {
            DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
            --padlen;
            signvalue = 0;
        }
        while (padlen > 0)
        {
            DOPR_OUTCH(buffer, *currlen, maxlen, '0');
            --padlen;
        }
    }
    while (padlen > 0)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
        --padlen;
    }

    if (signvalue)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
    }

    while (iplace > 0)
    {
        --iplace;
        DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]);
    }

    /*
     * Decimal point.  This should probably use locale to find the correct
     * char to print out.
     */
    if (max > 0)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, '.');

        while (zpadlen > 0)
        {
            DOPR_OUTCH(buffer, *currlen, maxlen, '0');
            --zpadlen;
        }

        while (fplace > 0)
        {
            --fplace;
            DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]);
        }
    }

    while (padlen < 0)
    {
        DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
        ++padlen;
    }
    return 0;
}

int va_snprintf (char *buffer, size_t buffersize, const char *format, ...)
{
    va_list args;
    int		result;

    va_start (args, format);
    result = va_vsnprintf (buffer, buffersize, format, args);
    va_end (args);

    return result;
}

int va_vsnprintf (char *buffer, size_t buffersize, const char *format, va_list args)
{
#ifdef __MINGW32__
    return dopr(buffer, buffersize, format, args);
#else
	return _vsnprintf(buffer, buffersize, format, args);
#endif
}

char *va(const char *format, ...)
{
    // now cycles through 8 buffers to avoid problems in most cases
    va_list		argptr;
    static char string[8][1024], *s;
    static int	stringindex = 0;

    s = string[stringindex];
    stringindex = (stringindex + 1) & 7;
    va_start (argptr, format);
    va_vsnprintf (s, sizeof(string[0]), format, argptr);
    va_end (argptr);

    return s;
}

/*
=============================================================================


QUAKE FILESYSTEM


=============================================================================
*/

int     com_filesize;

//
// in memory
//


typedef struct
{
    char    name[MAX_QPATH];
    int             filepos, filelen;
} packfile_t;


typedef struct pack_s
{
    char    filename[MAX_OSPATH];
    int             handle;
    int             numfiles;
    packfile_t      *files;
} pack_t;


//
// on disk
//
typedef struct
{
    char    name[56];
    int             filepos, filelen;
} dpackfile_t;


typedef struct
{
    char    id[4];
    int             dirofs;
    int             dirlen;
} dpackheader_t;


#define MAX_FILES_IN_PACK       5000
char    com_cachedir[MAX_OSPATH];
char    com_gamedir[MAX_OSPATH];

#ifdef  USERPREF_DIR
char    com_prefdir[MAX_OSPATH];
#endif


typedef struct searchpath_s
{
    char    filename[MAX_OSPATH];
    pack_t  *pack;          // only one of filename / pack will be used
    struct searchpath_s *next;
} searchpath_t;

searchpath_t    *com_searchpaths;

/*
============
COM_Path_f


============
*/
void COM_Path_f (void)
{
    searchpath_t    *s;

    Con_Printf ("Current search path:\n");
    for (s=com_searchpaths ; s ; s=s->next)
    {
        if (s->pack)
        {
            Con_Printf ("%s (%i files)\n", s->pack->filename, s->pack->numfiles);
        }
        else
            Con_Printf ("%s\n", s->filename);
    }
}

/*
============
COM_WriteFile


The filename will be prefixed by the current game directory
============
*/
void COM_WriteFile (char *filename, void *data, int len)
{
    int             handle;
    char    name[MAX_OSPATH];

    sprintf (name, "%s/%s", com_gamedir, filename);


    handle = Sys_FileOpenWrite (name);
    if (handle == -1)
    {
        Sys_Printf ("COM_WriteFile: failed on %s\n", name);
        return;
    }

    Sys_Printf ("COM_WriteFile: %s\n", name);
    Sys_FileWrite (handle, data, len);
    Sys_FileClose (handle);
}

/*
============
COM_CreatePath


Only used for CopyFile
============
*/
void    COM_CreatePath (char *path)
{
    char    *ofs;

    for (ofs = path+1 ; *ofs ; ofs++)
    {
        if (*ofs == '/')
        {
            // create the directory
            *ofs = 0;
            Sys_mkdir (path);
            *ofs = '/';
        }
    }
}

/*
===========
COM_CopyFile


Copies a file over from the net to the local cache, creating any directories
needed.  This is for the convenience of developers using ISDN from home.
===========
*/
void COM_CopyFile (char *netpath, char *cachepath)
{
    int             in, out;
    int             remaining, count;
    char    buf[4096];

    remaining = Sys_FileOpenRead (netpath, &in);
    COM_CreatePath (cachepath);     // create directories up to the cache file
    out = Sys_FileOpenWrite (cachepath);

    while (remaining)
    {
        if (remaining < sizeof(buf))
            count = remaining;
        else
            count = sizeof(buf);
        Sys_FileRead (in, buf, count);
        Sys_FileWrite (out, buf, count);
        remaining -= count;
    }
    Sys_FileClose (in);
    Sys_FileClose (out);
}


/*
===========
COM_FindFile


Finds the file in the search path.
Sets com_filesize and one of handle or file
===========
*/
int COM_FindFile (const char *filename, int *handle, FILE **file)
{
    searchpath_t    *search;
    char            netpath[MAX_OSPATH];
    char            cachepath[MAX_OSPATH];
    pack_t          *pak;
    int                     i;
    int                     findtime, cachetime;


    if (file && handle)
    {
        Sys_Error ("COM_FindFile: both handle and file set");
    }

    if (!file && !handle)
    {
        Sys_Error ("COM_FindFile: neither handle nor file set");
    }

//
// search through the path, one element at a time
//
    search = com_searchpaths;

    if (proghack)
    {
        // gross hack to use quake 1 progs with quake 2 maps
        if (!strcmp(filename, "progs.dat"))
        {
            search = search->next;
        }
    }


    for (/**/ ; search ; search = search->next)
    {
        // is the element a pak file?
        if (search->pack)
        {
            // look through all the pak file elements
            pak = search->pack;

            for (i=0 ; i<pak->numfiles ; i++)
            {
                if (!strcmp (pak->files[i].name, filename))
                {
                    // found it!
                    Sys_Printf ("PackFile: %s : %s\n",pak->filename, filename);

                    if (handle)
                    {
                        *handle = pak->handle;
                        Sys_FileSeek (pak->handle, pak->files[i].filepos);
                    }
                    else
                    {
                        // open a new file on the pakfile
                        *file = fopen (pak->filename, "rb");

                        if (*file)
                        {
                            fseek (*file, pak->files[i].filepos, SEEK_SET);
                        }
                    }
                    com_filesize = pak->files[i].filelen;
                    return com_filesize;
                }
            }
        }
        else
        {
            // check a file in the directory tree
            if (!static_registered)
            {
                // if not a registered version, don't ever go beyond base
                if ( strchr (filename, '\\') || strchr (filename,'/')) continue;
            }

            //see if the filename is already an absolute path
            //if it is don't reexpand it
            //Are absolute paths prefixed with / on mac also???
#if defined(_WIN32)
            if (filename[1] != ':') // c:\something
#else
            if (filename[0] != '/') // /blah/
#endif
                //expand filename to absolute path
                sprintf (netpath, "%s/%s",search->filename, filename);
            else
            {
                //already absolute just copy it
                strncpy (netpath,filename,sizeof(netpath));
            }

            findtime = Sys_FileTime (netpath);
            if (findtime == -1)
                continue;

            // see if the file needs to be updated in the cache
            if (!com_cachedir[0])
                strncpy (cachepath, netpath,sizeof(cachepath));
            else
            {
#if defined(_WIN32)
                if ((strlen(netpath) < 2) || (netpath[1] != ':'))
                    sprintf (cachepath,"%s%s", com_cachedir, netpath);
                else
                    sprintf (cachepath,"%s%s", com_cachedir, netpath+2);
#else
                sprintf (cachepath,"%s%s", com_cachedir, netpath);
#endif
                cachetime = Sys_FileTime (cachepath);

                if (cachetime < findtime)
                {
                    COM_CopyFile (netpath, cachepath);
                }
                strncpy (netpath, cachepath,sizeof(netpath));
            }
            Sys_Printf ("FindFile: %s\n",netpath);
            com_filesize = Sys_FileOpenRead (netpath, &i);

            if (handle)
            {
                *handle = i;
            }
            else
            {
                Sys_FileClose (i);
                *file = fopen (netpath, "rb");
            }
            return com_filesize;
        }
    }
    Sys_Printf ("FindFile: can't find %s\n", filename);

    if (handle)
    {
        *handle = -1;
    }
    else
    {
        *file = NULL;
    }
    com_filesize = -1;

    return -1;
}

/*
===========
COM_FindAllExt

Finds all files with the given extension, and calls the callback for every found file.
Extensions are up to 8 chars WITHOUT the "."
===========
*/

void COM_FindAllExt (char *filedir, char *fileext, void (*callback)(const char *))
{
    searchpath_t    *search;
    char            netpath[MAX_OSPATH];
    char			sysfileext[32];
    pack_t          *pak;
    int             i, dirlength;
    dirdata_t		dirdata;

    dirlength = Q_strlen(filedir);
//
// search through the path, one element at a time
//
    for (search = com_searchpaths ; search ; search = search->next)
    {
        // is the element a pak file?
        if (search->pack)
        {
            // look through all the pak file elements
            pak = search->pack;

            for (i=0 ; i<pak->numfiles ; i++)
            {
                if (!Q_strncmp (pak->files[i].name, filedir, dirlength) && !Q_strcmp(COM_FileExtension(pak->files[i].name), fileext))
                {
                    //found one
                    callback(pak->files[i].name);
                }
            }
        }
        else
        {
            sprintf (netpath, "%s/%s",search->filename,filedir);
            sprintf (sysfileext, "*.%s",fileext);

#if defined(_WIN32)
            for (i=0; i<(size_t) strlen(netpath); i++)
            {
                if (netpath[i] == '/')
				{
					netpath[i] = '\\';
				}
            }
#endif
            //Con_Printf("try %s %s\n", netpath, sysfileext);

            if (Sys_Findfirst(netpath,sysfileext,&dirdata))
            {
                do
                {
                    callback(dirdata.entry);
                }
                while (Sys_Findnext( &dirdata ) != NULL);
            }
        }
    }
}

/*
===========
COM_OpenFile


filename never has a leading slash, but may contain directory walks
returns a handle and a length
it may actually be inside a pak file
===========
*/
int COM_OpenFile (const char *filename, int *handle)
{
    return COM_FindFile (filename, handle, NULL);
}

/*
===========
COM_FOpenFile


If the requested file is inside a packfile, a new FILE * will be opened
into the file.
===========
*/
int COM_FOpenFile (const char *filename, FILE **file)
{
    return COM_FindFile (filename, NULL, file);
}

/*
============
COM_CloseFile


If it is a pak file handle, don't really close it
============
*/
void COM_CloseFile (int h)
{
    searchpath_t    *s;

    for (s = com_searchpaths ; s ; s=s->next)
    {
        if (s->pack && s->pack->handle == h) return;
    }
    Sys_FileClose (h);
}

/*
============
COM_LoadFile


Filename are reletive to the quake directory.
Allways appends a 0 byte.
============
*/
cache_user_t    *loadcache;
byte            *loadbuf;
int             loadsize;
byte *COM_LoadFile (const char *path, int usehunk)
{
    int             h;
    byte            *buf;
    char            base[MAX_OSPATH];
    int             len;

    buf = NULL;     // quiet compiler warning


// look for it in the filesystem or pack files
    len = COM_OpenFile (path, &h);
    if (h == -1)
        return NULL;

// extract the filename base name for hunk tag
    COM_FileBase (path, base);

    if (usehunk == 1)
        buf = Hunk_AllocName (len+1, base);
    else if (usehunk == 2)
        buf = Hunk_TempAlloc (len+1);
    else if (usehunk == 0)
        buf = Z_Malloc (len+1);
    else if (usehunk == 3)
        buf = Cache_Alloc (loadcache, len+1, base);
    else if (usehunk == 4)
    {
        if (len+1 > loadsize)
            buf = Hunk_TempAlloc (len+1);
        else
            buf = loadbuf;
    }
    else
        Sys_Error ("COM_LoadFile: bad usehunk");


    if (!buf)
        Sys_Error ("COM_LoadFile: not enough space for %s", path);

    ((byte *)buf)[len] = 0;

    Draw_BeginDisc ();
    Sys_FileRead (h, buf, len);
    COM_CloseFile (h);
    Draw_EndDisc ();


    return buf;
}

byte *COM_LoadHunkFile (const char *path)
{
    return COM_LoadFile (path, 1);
}

byte *COM_LoadTempFile (const char *path)
{
    return COM_LoadFile (path, 2);
}

void COM_LoadCacheFile (const char *path, struct cache_user_s *cu)
{
    loadcache = cu;
    COM_LoadFile (path, 3);
}

// uses temp hunk if larger than bufsize
byte *COM_LoadStackFile (const char *path, void *buffer, int bufsize)
{
    byte    *buf;

    loadbuf = (byte *)buffer;
    loadsize = bufsize;
    buf = COM_LoadFile (path, 4);

    return buf;
}

/*
=================
COM_LoadPackFile


Takes an explicit (not game tree related) path to a pak file.


Loads the header and directory, adding the files at the beginning
of the list so they override previous pack files.
=================
*/
pack_t *COM_LoadPackFile (char *packfile)
{
    dpackheader_t   header;
    int             i;
    packfile_t      *newfiles;
    int             numpackfiles;
    pack_t          *pack;
    int             packhandle;
    dpackfile_t     info[MAX_FILES_IN_PACK];
    unsigned short  crc;

    if (Sys_FileOpenRead (packfile, &packhandle) == -1)
    {
        return NULL;
    }
    Sys_FileRead (packhandle, (void *)&header, sizeof(header));

    if (header.id[0] != 'P' || header.id[1] != 'A' || header.id[2] != 'C' || header.id[3] != 'K')
        Sys_Error ("%s is not a packfile", packfile);
    header.dirofs = LittleLong (header.dirofs);
    header.dirlen = LittleLong (header.dirlen);
    numpackfiles = header.dirlen / sizeof(dpackfile_t);

    if (numpackfiles > MAX_FILES_IN_PACK)
        Sys_Error ("%s has %i files", packfile, numpackfiles);

    if (numpackfiles != PAK0_COUNT)
        com_modified = true;    // not the original file

    newfiles = Hunk_AllocName (numpackfiles * sizeof(packfile_t), "packfile");

    Sys_FileSeek (packhandle, header.dirofs);
    Sys_FileRead (packhandle, (void *)info, header.dirlen);


// crc the directory to check for modifications
    CRC_Init (&crc);
    for (i=0 ; i<header.dirlen ; i++)
        CRC_ProcessByte (&crc, ((byte *)info)[i]);
    if (crc != PAK0_CRC)
        com_modified = true;

// parse the directory
    for (i=0 ; i<numpackfiles ; i++)
    {
        strncpy (newfiles[i].name, info[i].name,sizeof(newfiles[i].name));
        newfiles[i].filepos = LittleLong(info[i].filepos);
        newfiles[i].filelen = LittleLong(info[i].filelen);
    }
    pack = Hunk_Alloc (sizeof (pack_t));
    strncpy (pack->filename, packfile,sizeof(pack->filename));
    pack->handle = packhandle;
    pack->numfiles = numpackfiles;
    pack->files = newfiles;

    Con_Printf ("Added packfile %s (%i files)\n", packfile, numpackfiles);
    return pack;
}

/*
================
COM_AddGameDirectory


Sets com_gamedir, adds the directory to the head of the path,
then loads and adds pak1.pak, pak2.pak, *.pak ...
================
*/
void COM_AddGameDirectory (char *dir)
{
    searchpath_t    *search, *otherpaths=NULL;
    pack_t          *pak;
    char            *filename;
    dirdata_t       dirdata;

// update current gamedir
    strncpy (com_gamedir, dir, sizeof(com_gamedir));
//
// add any pak files , pak*.pak first
//
    if (Sys_Findfirst (dir, "*.pak", &dirdata))
    {
        do
        {
            pak = COM_LoadPackFile (dirdata.entry);
            if (!pak)
                break;
            filename=COM_SkipPath(dirdata.entry);
            search = Hunk_Alloc (sizeof(searchpath_t));
            search->pack = pak;
            if (Q_strncasecmp(filename,"pak",3))
            {
                // pak*.pak
                search->next = otherpaths;
                otherpaths = search;
            }
            else
            {
                // *.pak
                search->next = com_searchpaths;
                com_searchpaths = search;
            }
        }
        while (Sys_Findnext( &dirdata ) != NULL);
    }

    if (otherpaths)
    {
        search = otherpaths;
        while (search->next)
            search = search->next;
        search->next = com_searchpaths;
        com_searchpaths = otherpaths;
    }
//
// add the directory to the search path last so it overrides paks
//
    search = Hunk_Alloc (sizeof(searchpath_t));
    strncpy (search->filename, dir, sizeof(search->filename));
    search->next = com_searchpaths;
    com_searchpaths = search;
//
// add the contents of the parms.txt file to the end of the command line
//
}

/* - DC -
================
COM_AddGameFS


 for a given base directory, call COM_AddGameDirectory on
 various sub-directories

================
*/
void COM_AddGameFS (char *basedir)
{
    int i;
//
// start up with GAMENAME by default (id1)
//
    COM_AddGameDirectory (va("%s/"GAMENAME, basedir) );

//PENTA: Make mods possible by making tenebrae part of the game
    COM_AddGameDirectory (va("%s/tenebrae", basedir) );


    if (COM_CheckParm ("-rogue"))
    {
        COM_AddGameDirectory (va("%s/rogue", basedir) );
    }

    if (COM_CheckParm ("-hipnotic"))
    {
        COM_AddGameDirectory (va("%s/hipnotic", basedir) );
    }

//
// -game <gamedir>
// Adds basedir/gamedir as an override game
//
    i = COM_CheckParm ("-game");

    if (i && i < com_argc-1)
    {
        com_modified = true;
        COM_AddGameDirectory (va("%s/%s", basedir, com_argv[i+1]));
    }
}

/*
================
COM_InitFilesystem
================
*/
void COM_InitFilesystem (void)
{
    int             i,j;
    char    basedir[MAX_OSPATH];
#if defined (USERPREF_DIR) /* - DC - user dir */
    char    userdir[MAX_OSPATH];
#endif
    searchpath_t    *search;

//
// -basedir <path>
// Overrides the system supplied base directory (under GAMENAME)
//
    i = COM_CheckParm ("-basedir");

    if (i && i < com_argc-1)
    {
        strncpy ( basedir, com_argv[i + 1], sizeof(basedir));
    }
    else
    {
        strncpy ( basedir, host_parms.basedir, sizeof(basedir));
    }
    j = strlen (basedir);

    if (j > 0)
    {
        if ((basedir[j-1] == '\\') || (basedir[j-1] == '/'))
        {
            basedir[j-1] = 0;
        }
    }
//
// -cachedir <path>
// Overrides the system supplied cache directory (NULL or /qcache)
// -cachedir - will disable caching.
//
    i = COM_CheckParm ("-cachedir");

    if (i && i < com_argc-1)
    {
        if (com_argv[i+1][0] == '-')
        {
            com_cachedir[0] = 0;
        }
        else
        {
            strncpy ( com_cachedir, com_argv[i+1], sizeof(com_cachedir));
        }
    }
    else if (host_parms.cachedir)
    {
        strncpy ( com_cachedir, host_parms.cachedir, sizeof(com_cachedir));
    }
    else
    {
        com_cachedir[0] = 0;
    }
    COM_AddGameFS (basedir);

#if defined (USERPREF_DIR) /* - DC - user dir */
    strncpy ( userdir, host_parms.userdir, sizeof(userdir));

    j = strlen (userdir);

    if (j > 0)
    {
        if ((userdir[j-1] == '\\') || (userdir[j-1] == '/'))
            userdir[j-1] = 0;
    }
    COM_AddGameFS (userdir);
#endif


//
// -path <dir or packfile> [<dir or packfile>] ...
// Fully specifies the exact serach path, overriding the generated one
//
    i = COM_CheckParm ("-path");

    if (i)
    {
        com_modified = true;
        com_searchpaths = NULL;

        while (++i < com_argc)
        {
            if (!com_argv[i] || com_argv[i][0] == '+' || com_argv[i][0] == '-') break;

            search = Hunk_Alloc (sizeof(searchpath_t));

            if ( !strcmp(COM_FileExtension(com_argv[i]), "pak") )
            {
                search->pack = COM_LoadPackFile (com_argv[i]);

                if (!search->pack)
                {
                    Sys_Error ("Couldn't load packfile: %s", com_argv[i]);
                }
            }
            else
            {
                strncpy (search->filename, com_argv[i], sizeof(search->filename));
            }
            search->next = com_searchpaths;
            com_searchpaths = search;
        }
    }

    if (COM_CheckParm ("-proghack"))
    {
        proghack = true;
    }
}




